US20090183927A1 - Method for measuring the useful load of a telehandler - Google Patents
Method for measuring the useful load of a telehandler Download PDFInfo
- Publication number
- US20090183927A1 US20090183927A1 US12/345,958 US34595808A US2009183927A1 US 20090183927 A1 US20090183927 A1 US 20090183927A1 US 34595808 A US34595808 A US 34595808A US 2009183927 A1 US2009183927 A1 US 2009183927A1
- Authority
- US
- United States
- Prior art keywords
- telehandler
- load
- useful load
- axle
- front axle
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
- B66F17/00—Safety devices, e.g. for limiting or indicating lifting force
- B66F17/003—Safety devices, e.g. for limiting or indicating lifting force for fork-lift trucks
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
- B66F9/00—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes
- B66F9/06—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes movable, with their loads, on wheels or the like, e.g. fork-lift trucks
- B66F9/075—Constructional features or details
- B66F9/20—Means for actuating or controlling masts, platforms, or forks
- B66F9/24—Electrical devices or systems
Definitions
- the present invention concerns a method for measuring the useful load of a telehandler according to the preamble of claim 1 .
- Telehandlers are commonly used in agriculture, building and the storage industry, and can be in the form of forklifts, wheel loaders, mobile cranes or working platforms.
- a floor-level transporter or telehandler which comprises an electronic memory and/or a data transfer unit, a device for collecting working data and a control unit.
- the latter is connected to the working data collection device and to the memory and/or data transfer unit.
- the control unit continuously prepares from the working data collected a working protocol and stores it in the memory or sends it to the data transfer unit.
- the working data collection device can comprise a load sensor to determine the weight of a load, which can be integrated in the load-holding means of the floor-level transporter. Alternatively, the weight of a load can be determined from an oil pressure in the hydraulic system of the transporter.
- the propose of the present invention is to indicate a method for measuring the useful load of a telehandler, such that the useful load can be measured with great accuracy without the need for a separate load sensor.
- the useful load from the change in the axle load on the front axle or the rear axle compared with the unloaded condition of the vehicle, with a defined distance between the useful load or load-holding device of the telehandler and the front axle or the rear axle, i.e., the load-holding device of the telehandler, which can be a scoop, a stacking fork, a gripper or a working platform, must be in a defined position.
- the load-holding device of the telehandler which can be a scoop, a stacking fork, a gripper or a working platform
- the useful load is proportional to the change of the axle load of the front or rear axle.
- the concept according to the invention provides a method for measuring the useful load that is simple to carry out and gives accurate results.
- the useful load calculated can be shown by a suitable indicator device or display.
- the method can be combined with LMI methods so that the useful load can be measured while at the same time critical load curve conditions can be recognized, since both methods make use of the same physical principle.
- FIGURE schematically illustrates the force situation in the case of an unloaded and a loaded telehandler.
- the left-hand side of the FIGURE shows the force situation of an unloaded telehandler.
- the axle load F FA — 1 on the front axle is given by:
- F FA — 1 F vehicle ⁇ [( F vehicle *x 2 )/ x 3 ]
- the axle load F FA — 2 on the front axle when the vehicle is loaded, as illustrated on the right in the FIGURE, is obtained as:
- F FA — 2 F vehicle +F Payload ⁇ [( F vehicle *x 2 ⁇ F payload *x 1 )/ x 3 ]
- F vehicle vehicle weight
- F Payload useful load
- x 1 distance of the useful load from the front axle
- x 2 distance between the front axle and the vehicle's center of gravity
- x 3 distance between the front and rear axles.
- the axle load on the rear axle is indexed F RA — 2 .
- F FA F Payload ⁇ [( F vehicle *x 2 ⁇ F payload *x 1 )/ x 3 ]+[( F vehicle *x 2 )/x 3 ]
- the useful load is proportional to the change of the axle load on the front axle so that, in this case, simple and accurate measurement of the useful load is made possible.
- a displacement of the vehicle's center of gravity that results from a useful load does not influence the calculation of the useful load in accordance with the invention.
Landscapes
- Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Transportation (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Civil Engineering (AREA)
- Force Measurement Appropriate To Specific Purposes (AREA)
- Vehicle Body Suspensions (AREA)
Abstract
Description
- This application claims priority from German Application Serial No. 10 2008 000 120.1 filed Jan. 22, 2008.
- The present invention concerns a method for measuring the useful load of a telehandler according to the preamble of claim 1.
- Telehandlers are commonly used in agriculture, building and the storage industry, and can be in the form of forklifts, wheel loaders, mobile cranes or working platforms.
- From the prior art, it is known to recognize, by way of LMI (Load Movement Indicator), critical situations in the load curve such as excessively high loading and/or a load that is too wide and to warn the driver visually and/or acoustically. For this the strain at the rear axle brackets is measured and from that the rear axle load is determined. Depending on the rear axle load, the tilt stability of the telehandler is then concluded.
- From DE 10 2006 010 291 A1, a floor-level transporter or telehandler is known, which comprises an electronic memory and/or a data transfer unit, a device for collecting working data and a control unit. The latter is connected to the working data collection device and to the memory and/or data transfer unit. In the known floor-level transporter, the control unit continuously prepares from the working data collected a working protocol and stores it in the memory or sends it to the data transfer unit. The working data collection device can comprise a load sensor to determine the weight of a load, which can be integrated in the load-holding means of the floor-level transporter. Alternatively, the weight of a load can be determined from an oil pressure in the hydraulic system of the transporter.
- The propose of the present invention is to indicate a method for measuring the useful load of a telehandler, such that the useful load can be measured with great accuracy without the need for a separate load sensor.
- Accordingly, it is proposed to calculate the useful load from the change in the axle load on the front axle or the rear axle compared with the unloaded condition of the vehicle, with a defined distance between the useful load or load-holding device of the telehandler and the front axle or the rear axle, i.e., the load-holding device of the telehandler, which can be a scoop, a stacking fork, a gripper or a working platform, must be in a defined position.
- In the distance between the useful load or load-holding device of the telehandler and the front or rear axle is kept constant, i.e., when the load-holding device is in a defined position, the useful load is proportional to the change of the axle load of the front or rear axle.
- The concept according to the invention provides a method for measuring the useful load that is simple to carry out and gives accurate results. The useful load calculated can be shown by a suitable indicator device or display.
- According to another embodiment of the invention, the method can be combined with LMI methods so that the useful load can be measured while at the same time critical load curve conditions can be recognized, since both methods make use of the same physical principle.
- The invention will now be described, by way of example, with reference to the accompanying drawings in which:
- The sole FIGURE schematically illustrates the force situation in the case of an unloaded and a loaded telehandler.
- The left-hand side of the FIGURE shows the force situation of an unloaded telehandler. Here, the axle load FFA
— 1 on the front axle is given by: -
F FA— 1 =F vehicle−[(F vehicle *x 2)/x 3] - where Fvehicle=weight of the vehicle, x2=distance between the front axle and the vehicle's center of gravity and x3=distance between the front axle and the rear axle. In the FIGURE, the axle load on the rear axle is indexed FRA
— 1. - The axle load FFA
— 2 on the front axle when the vehicle is loaded, as illustrated on the right in the FIGURE, is obtained as: -
F FA— 2 =F vehicle +F Payload−[(F vehicle *x 2 −F payload *x 1)/x 3] - where Fvehicle=vehicle weight, FPayload=useful load, x1=distance of the useful load from the front axle, x2=distance between the front axle and the vehicle's center of gravity and x3=distance between the front and rear axles. The axle load on the rear axle is indexed FRA
— 2. - From the above, the change ΔFFA of the axle load on the front axle that results from loading is given by:
-
ΔF FA =F Payload−[(F vehicle *x 2 −F payload *x 1)/x 3]+[(F vehicle *x 2)/x3] -
ΔF FA *x 3 −F Payload *x 3 =F Payload *x 1 -
and ΔF FA *x 3 =F Payload*(x 1 +x 3) - From this, it follows that the useful load FPayload is:
-
F Payload =ΔF FA *[x 3/(x1 +x 3)] - This means that when the distance x1 of the useful load or the load-holding device of the telehandler from the front axle is kept constant, the useful load is proportional to the change of the axle load on the front axle so that, in this case, simple and accurate measurement of the useful load is made possible. Advantageously, a displacement of the vehicle's center of gravity that results from a useful load does not influence the calculation of the useful load in accordance with the invention.
-
- FFA
— 1 axle load on the front axle of an unloaded vehicle - FFA
— 2 axle load on the front axle of a loaded vehicle - FRA
— 1 axle load on the rear axle of an unloaded vehicle - FRA
— 2 axle load on the rear axle of a loaded vehicle - Fvehicle weight of the vehicle
- FPayload useful load
- x1 distance between the useful load and the front axle
- x2 distance between the front axle and the vehicle's center of gravity
- x3 distance between the front axle and the rear axle
Claims (6)
F Payload =ΔF FA *[x 3/(x 1 +x 3)]
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102008000120A DE102008000120A1 (en) | 2008-01-22 | 2008-01-22 | Method of measuring the payload of a telehandler |
DE102008000120.1 | 2008-01-22 | ||
DE102008000120 | 2008-01-22 |
Publications (2)
Publication Number | Publication Date |
---|---|
US20090183927A1 true US20090183927A1 (en) | 2009-07-23 |
US8019516B2 US8019516B2 (en) | 2011-09-13 |
Family
ID=40785671
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US12/345,958 Expired - Fee Related US8019516B2 (en) | 2008-01-22 | 2008-12-30 | Method for measuring the useful load of a telehandler |
Country Status (2)
Country | Link |
---|---|
US (1) | US8019516B2 (en) |
DE (1) | DE102008000120A1 (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20100324955A1 (en) * | 2009-06-22 | 2010-12-23 | Mark Rinehart | Asset information reporting |
US20130096799A1 (en) * | 2009-06-22 | 2013-04-18 | Ztr Control Systems, Inc. | Method for utilization calculation on equipment including independent component |
JP2015028480A (en) * | 2013-07-26 | 2015-02-12 | ジェイ. シー. バンフォード エクスカヴェイターズ リミテッドJ.C. Bamford Excavators Limited | Method of measuring weight of load body |
Citations (15)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2767394A (en) * | 1954-04-08 | 1956-10-16 | Emmanuel Kaye | Tipping moment indicator for lifting trucks |
US2858070A (en) * | 1955-11-17 | 1958-10-28 | Scharff Leon | Moment computing and indicating systems |
US4421186A (en) * | 1980-08-25 | 1983-12-20 | Weigh-Tronix, Inc. | Fork lift scale |
US4588038A (en) * | 1985-02-26 | 1986-05-13 | Kabushiki Kaisha Komatsu Seisakusho | Load weight measuring method |
US4635739A (en) * | 1985-06-25 | 1987-01-13 | Caterpillar Inc. | Payload monitor |
US4942529A (en) * | 1988-05-26 | 1990-07-17 | The Raymond Corporation | Lift truck control systems |
US5067572A (en) * | 1990-08-20 | 1991-11-26 | Caterpillar Inc. | Dynamic payload monitor |
US5070953A (en) * | 1990-08-20 | 1991-12-10 | Caterpillar Inc. | Dynamic payload monitor |
US5205514A (en) * | 1990-10-20 | 1993-04-27 | Vdo Adolf Schindling Ag | Arrangement of at least one sensor on the landing gear of an aircraft for measuring its weight and position of center of gravity |
US6437701B1 (en) * | 2000-12-18 | 2002-08-20 | Caterpillar Inc. | Apparatus and method for a machine stability system for an articulated work machine |
US20040045745A1 (en) * | 2002-06-14 | 2004-03-11 | Hans-Jorg Schiebel | Lifting device for an industrial truck |
US20040200644A1 (en) * | 2003-04-08 | 2004-10-14 | Alan Paine | Safe load lifting measurement device |
US20060070773A1 (en) * | 2004-10-06 | 2006-04-06 | Caterpillar Inc. | Payload overload control system |
US20060103336A1 (en) * | 2002-07-12 | 2006-05-18 | J.C. Bamford Excavators Limited | Control system for a load handling apparatus |
US20070208476A1 (en) * | 2006-03-03 | 2007-09-06 | Jungheinrich Aktiengesellschaft | Industrial truck with acquirement of utilization data |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4511974A (en) * | 1981-02-04 | 1985-04-16 | Kabushiki Kaisha Toyoda Jidoshokki Seisakusho | Load condition indicating method and apparatus for forklift truck |
GB8724206D0 (en) * | 1987-10-15 | 1987-11-18 | Bamford Excavators Ltd | Vehicle |
DE3820757A1 (en) * | 1988-06-18 | 1989-12-28 | Bosch Gmbh Robert | Apparatus for determining the weight of suspended loads |
DE10304658A1 (en) * | 2003-02-05 | 2004-08-19 | Bosch Rexroth Ag | Industrial truck |
-
2008
- 2008-01-22 DE DE102008000120A patent/DE102008000120A1/en not_active Withdrawn
- 2008-12-30 US US12/345,958 patent/US8019516B2/en not_active Expired - Fee Related
Patent Citations (15)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2767394A (en) * | 1954-04-08 | 1956-10-16 | Emmanuel Kaye | Tipping moment indicator for lifting trucks |
US2858070A (en) * | 1955-11-17 | 1958-10-28 | Scharff Leon | Moment computing and indicating systems |
US4421186A (en) * | 1980-08-25 | 1983-12-20 | Weigh-Tronix, Inc. | Fork lift scale |
US4588038A (en) * | 1985-02-26 | 1986-05-13 | Kabushiki Kaisha Komatsu Seisakusho | Load weight measuring method |
US4635739A (en) * | 1985-06-25 | 1987-01-13 | Caterpillar Inc. | Payload monitor |
US4942529A (en) * | 1988-05-26 | 1990-07-17 | The Raymond Corporation | Lift truck control systems |
US5067572A (en) * | 1990-08-20 | 1991-11-26 | Caterpillar Inc. | Dynamic payload monitor |
US5070953A (en) * | 1990-08-20 | 1991-12-10 | Caterpillar Inc. | Dynamic payload monitor |
US5205514A (en) * | 1990-10-20 | 1993-04-27 | Vdo Adolf Schindling Ag | Arrangement of at least one sensor on the landing gear of an aircraft for measuring its weight and position of center of gravity |
US6437701B1 (en) * | 2000-12-18 | 2002-08-20 | Caterpillar Inc. | Apparatus and method for a machine stability system for an articulated work machine |
US20040045745A1 (en) * | 2002-06-14 | 2004-03-11 | Hans-Jorg Schiebel | Lifting device for an industrial truck |
US20060103336A1 (en) * | 2002-07-12 | 2006-05-18 | J.C. Bamford Excavators Limited | Control system for a load handling apparatus |
US20040200644A1 (en) * | 2003-04-08 | 2004-10-14 | Alan Paine | Safe load lifting measurement device |
US20060070773A1 (en) * | 2004-10-06 | 2006-04-06 | Caterpillar Inc. | Payload overload control system |
US20070208476A1 (en) * | 2006-03-03 | 2007-09-06 | Jungheinrich Aktiengesellschaft | Industrial truck with acquirement of utilization data |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20100324955A1 (en) * | 2009-06-22 | 2010-12-23 | Mark Rinehart | Asset information reporting |
US20130096799A1 (en) * | 2009-06-22 | 2013-04-18 | Ztr Control Systems, Inc. | Method for utilization calculation on equipment including independent component |
US9460051B2 (en) * | 2009-06-22 | 2016-10-04 | Ztr Control Systems, Inc. | Method for utilization calculation on equipment including independent component |
EP2587419A2 (en) | 2011-10-17 | 2013-05-01 | ZTR Control Systems, Inc. | Method for utilization calculation on mobile equipment including independent component |
JP2015028480A (en) * | 2013-07-26 | 2015-02-12 | ジェイ. シー. バンフォード エクスカヴェイターズ リミテッドJ.C. Bamford Excavators Limited | Method of measuring weight of load body |
Also Published As
Publication number | Publication date |
---|---|
DE102008000120A1 (en) | 2009-07-23 |
US8019516B2 (en) | 2011-09-13 |
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Owner name: ZF FRIEDRICHSHAFEN AG, GERMANY Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:HUBER, TILO;REEL/FRAME:022049/0084 Effective date: 20081014 |
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Effective date: 20150913 |
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STCH | Information on status: patent discontinuation |
Free format text: PATENT EXPIRED DUE TO NONPAYMENT OF MAINTENANCE FEES UNDER 37 CFR 1.362 |